shunping commented on PR #35501:
URL: https://github.com/apache/beam/pull/35501#issuecomment-3026095474

   I am trying to find out the root cause of why we need MySQLdb after 
testcontainers upgrade.
   
   I followed the failed test 
code(https://github.com/apache/beam/blob/623e998f48ea5de2953286065ad77957e8c1b9a6/sdks/python/apache_beam/io/external/xlang_jdbcio_it_test.py#L123-L140),
 extracted the following code block and ran it on version 3.7.1 and 4.10.0.
   
   ```python
   from testcontainers.mysql import MySqlContainer
   container = MySqlContainer()
   container.start()
   print(container.get_connection_url())
   ```
   
   Connection url from version 3.7.1
   ```
   mysql+pymysql://test:test@localhost:32768/test
   ```
   
   Connection url from version 4.10.0
   ```
   mysql://test:test@localhost:32770/test
   ```
   
   In version 3.7.1, it uses pymysql driver. In version 4.10.0, it does not 
specify the driver and I think it is default to MySQLdb.


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